How to update Cisco OS version

Hi, I have a stack of Cisco Switches that I would like to upgrade the OS version. There are setting already inside the switches. How can I upgrade the OS and keep the current setting, such as vlan, ports config and trunks ? Thanks
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The instructions should still be applicable

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AkinsdNetwork AdministratorCommented:
IOS and Configuration are two different files.

Upgrading the IOS does not affect the configuration. However, upgrading the IOS with another one with different features may cause a configuration to be disabled but still present.

See my video on youtube for a simple upgrade procedure
Craig BeckCommented:
Just make sure that the config on your switch is supported in the newer code.  Some commands have been depreciated now so won't apply when the stack reloads.
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